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CRC Press eBooks

Uncertainty

Published Aug 1, 2003• 0 citations
Publisher

Abstract

Hoyle, Fred If matters still seem very uncertain it must always be remembered that clearly sign-posted roads are not to be expected at a pioneering frontier. Unknown Heisenberg might have slept here.
DOI
10.1201/9781420034677-169

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•Sep 14, 2023•0 citations
The Heisenberg uncertainty principle for material objects is an essential corner stone of quantum mechanics and clearly visualizes the wave nature of matter. Here, we report a demonstration of the Heisenberg uncertainty principle for the fullerene molecule C70{\mathrm{C}}_{70}C70​ at a temperature of 900 K. We do this by showing the increase in molecular momentum spread after passage through a narrow slit with a variable width down to 70 nm. We find good quantitative agreement with the theoretical expectation.
Abstract One of the foundational principles of quantum mechanics is Heisenberg’s uncertainty relation. According to this relation, no one can measure both the position of a particle and how fast it is moving simultaneously no matter how precise the measuring instruments. Heisenberg’s uncertainty relation and the associated Bohr’s principle of complementarity are explained using simple examples. The idea that measurement disturbs the system is a source of the uncertainty. The philosophical question whether the uncertainty represents only our inability to measure the properties precisely or it has much deeper consequences related to the question of reality is also discussed.